<template>
  <div class="container">
    <div class="page-title">滑动组件</div>
    <ul>
      <li
        class="list-item"
        v-for="(item, index) in list"
        data-type="0"
        :key="index"
      >
        <div
          class="list-box"
          @touchstart.capture="touchStart"
          @touchend.capture="touchEnd"
          @click="skip"
        >
          <!-- <img class="list-img" :src="item.imgUrl" alt="" /> -->
          <div class="list-content">
            <p class="title">{{ item.title }}</p>
            <p class="tips">{{ item.tips }}</p>
            <p class="time">{{ item.time }}</p>
          </div>
        </div>
        <div class="delete" @click="deleteItem" :data-index="index">删除</div>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  name: "index",
  data() {
    return {
      list: [
        {
          title: "Chrome更新了",
          imgUrl: "./static/images/Chrome.png",
          tips: "不再支持Flash视频播放",
          time: "上午 8:30",
        },
        {
          title: "电影新资讯",
          imgUrl: "./static/images/Sina.png",
          tips:
            "电影《红海行动》上映以来票房暴涨，很多国人表示对国产电影有了新的改观",
          time: "上午 12:00",
        },
        {
          title: "聚焦两会·共筑中国梦",
          imgUrl: "./static/images/video.png",
          tips: "习近平代表的两会故事",
          time: "下午 17:45",
        },
        {
          title: "微信团队",
          imgUrl: "./static/images/Wechat.png",
          tips: "您的帐号有异常登录，如非本人操作，请及时修改密码",
          time: "昨天",
        },
      ],
      startX: 0,
      endX: 0,
    };
  },
  methods: {
    //跳转
    skip() {
      if (this.checkSlide()) {
        this.restSlide();
      } else {
        alert("You click the slide!");
      }
    },
    //滑动开始
    touchStart(e) {
      // 记录初始位置
      this.startX = e.touches[0].clientX;
    },
    //滑动结束
    touchEnd(e) {
      // 当前滑动的父级元素
      let parentElement = e.currentTarget.parentElement;
      // 记录结束位置
      this.endX = e.changedTouches[0].clientX;
      // 左滑
      if (parentElement.dataset.type == 0 && this.startX - this.endX > 30) {
        this.restSlide();
        parentElement.dataset.type = 1;
      }
      // 右滑
      if (parentElement.dataset.type == 1 && this.startX - this.endX < -30) {
        this.restSlide();
        parentElement.dataset.type = 0;
      }
      this.startX = 0;
      this.endX = 0;
    },
    //判断当前是否有滑块处于滑动状态
    checkSlide() {
      let listItems = document.querySelectorAll(".list-item");
      for (let i = 0; i < listItems.length; i++) {
        if (listItems[i].dataset.type == 1) {
          return true;
        }
      }
      return false;
    },
    //复位滑动状态
    restSlide() {
      let listItems = document.querySelectorAll(".list-item");
      // 复位
      for (let i = 0; i < listItems.length; i++) {
        listItems[i].dataset.type = 0;
      }
    },
    //删除
    deleteItem(e) {
      // 当前索引
      let index = e.currentTarget.dataset.index;
      // 复位
      this.restSlide();
      // 删除
      this.list.splice(index, 1);
    },
  },
};
</script>

<style scoped>
.page-title {
  text-align: center;
  font-size: 17px;
  padding: 10px 15px;
  position: relative;
}
.page-title:after {
  content: " ";
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #ccc;
  color: #ccc;
  -webkit-transform-origin: 0 100%;
  transform-origin: 0 100%;
  -webkit-transform: scaleY(0.5);
  transform: scaleY(0.5);
  z-index: 2;
}
.list-item {
  position: relative;
  height: 1.6rem;
  -webkit-transition: all 0.2s;
  transition: all 0.2s;
}
.list-item[data-type="0"] {
  transform: translate3d(0, 0, 0);
}
.list-item[data-type="1"] {
  transform: translate3d(-2rem, 0, 0);
}
.list-item:after {
  content: " ";
  position: absolute;
  left: 0.2rem;
  bottom: 0;
  right: 0;
  height: 1px;
  border-bottom: 1px solid #ccc;
  color: #ccc;
  -webkit-transform-origin: 0 100%;
  transform-origin: 0 100%;
  -webkit-transform: scaleY(0.5);
  transform: scaleY(0.5);
  z-index: 2;
}
.list-box {
  padding: 0.2rem;
  background: #fff;
  display: flex;
  align-items: center;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  justify-content: flex-end;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  font-size: 0;
}
.list-item .list-img {
  display: block;
  width: 1rem;
  height: 1rem;
}
.list-item .list-content {
  padding: 0.1rem 0 0.1rem 0.2rem;
  position: relative;
  flex: 1;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  overflow: hidden;
}
.list-item .title {
  display: block;
  color: #333;
  overflow: hidden;
  font-size: 15px;
  font-weight: bold;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.list-item .tips {
  display: block;
  overflow: hidden;
  font-size: 12px;
  color: #999;
  line-height: 20px;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.list-item .time {
  display: block;
  font-size: 12px;
  position: absolute;
  right: 0;
  top: 0.1rem;
  color: #666;
}
.list-item .delete {
  width: 2rem;
  height: 1.6rem;
  background: #ff4949;
  font-size: 17px;
  color: #fff;
  text-align: center;
  line-height: 1.6rem;
  position: absolute;
  top: 0;
  right: -2rem;
}
</style>
